Swollen lymph node in groin

Hello,

Im a 37 year old male. I noticed a swollen lymph node in my left groin 3 days ago. Im sure its nothing, but i have trouble not thinking about it. I had a cold maybe 2-3 weeks ago, but feel pretty healthy now.

Only cause i can think of was something that occurred 2 weeks ago. Had some severe stomach cramps in the middle of the night. Went to the bathroom, and lost consciousness when i stood up. I fell and hit my head on the shower wall causing me to get 4 stitches above my eye. All test at the hospital (blood, EKG, cat scan, urine) came back good. Only pain since is around my abdomen where i landed in the shower.

Could the be the cause of the swollen node? Something else? Any ideas would be beneficial to read. Thanks.

Chris